Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Compensation Matters (Details)

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Share-Based Compensation and Other Compensation Matters (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-Based Compensation      
Share-based compensation cost $ 7,456 $ 6,963 $ 6,095
General, administrative and leasing expenses      
Share-Based Compensation      
Share-based compensation cost 5,748 5,415 4,649
Property operating expenses      
Share-Based Compensation      
Share-based compensation cost 966 961 966
Property operating expenses      
Share-Based Compensation      
Share-based compensation cost $ 742 $ 587 $ 480